NSA Slugs in a RAW HM1000x LRT? New video from Mountain Sport Airguns!

Curious what they did to their rifle to get there. I saw the numbers that were reported with the 34gr NSA slugs on their site, which reported low 930's. I've tinkered quite a bit with my new .25, and while I can get the 34gr MKI and MKII's traveling over 950, the VK's and NSA's feel a little tight in this poly barrel. Lapping might be in order, but I'm not in a rush to do so.

I chrono'd a 33gr VK at 943 and a 34gr NSA at 923. My reg is still only down to around 155-158 bar, I have some room to play. I've had to add pretension on my hammer assembly to get past the 64fpe mark.